The Symphony 64 features extended audio routing with VBus and SBus technology. VBus allows you to route standalone software instruments between Core Audio-based applications, instead of running them as plug-ins. Symphony''s SBus, on the other hand, doubles the DSP power of the Symphony System by facilitating, with a single cable, the communication of digital audio between Symphony-equipped Macs. This technology lets you route audio to a second computer and back again for plug-in processing, sample libraries, soft-synth players, and session transfers from one Core Audio application to another.

The system also offers up to 128 channels of I/O per Mac Pro, near zero latency performance, Apogee''s Maestro software for advanced control and routing, and compatibility with any Core Audio application.

Those of you who purchased a Symphony 32 card 60 days before October 3, 2008 may upgrade to the Symphony 64 card for $295, through Apogee.